Better RTK GPUS support for Ardupilot

Choosing between L1, L2, L5

• Most RTK solutions support L1/L2.

• When choosing GPSs for base station and rover (drone), ensure both support the same frequency bands.

  • If, for example, drone supports L1,L5 and base supports only L1; we are effectively handicapping the drone to just L1

  • RTK requires common frequency bands for performing the computation.

  • If using L1,L2 on drone and L1,L2 on base; both the bands are tracked by the drone and RTK will be able to perform at dual frequency and better performance.

Dead Reckoning Modules

• These modules use info from other sensors (gyro, accelero, etc) to calculate position.

• This is useful when the GPS position is difficult, eg: tunnels, parking lots.

List of GPSes

Note about Holybro and Ublox: many of the Holybro GPSes incorporate Ublox gps tech.

• Big GPS Round Up

• $60: PX1125R L1/L5 RTK

• $109: PX1172RDP : RTK dead reckoning

• F9P

  • L1/L5

  • $350-400: https://holybro.com/products/h-rtk-f9p-gnss-series?variant=41466787201213

  • https://www.u-blox.com/en/product/neo-f9p-module?legacy=Current#Product-Selection (contact them for price)

  • $129: https://www.u-blox.com/en/product/zed-f9p-module

  • ZED vs NEO:

    • ZED vs NEO

    • NEO seems to be super precise, involving automated industrial moving machinery :|

    • ZED is about enable mobile customers access to L1/L5.

  • Three variants: only drone, only base, both base and drone.

• M8P

  • We already have some of these.

  • L1 only

  • $199: https://holybro.com/products/h-rtk-m8p-gnss-series(discontinued on Holybro site)

  • ($129-$149)https://www.u-blox.com/en/product/neo-m8p-series

  • Three variants: only drone functionality both base and drone.

• NEO-D9S

  • Says L band, it means all L1,2,3 and more!.

  • Support some form of correction data, not sure if it’s same as rtk

  • https://www.u-blox.com/en/product/neo-d9s-series

• ZED F9R

  • Supports usage as RTK rover, not sure if it can be used as base station.

  • https://www.u-blox.com/en/product/zed-f9r-module